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Heat 1 tbsp olive oil in a large non-stick frying pan, then fry the lamb and half the spice mix over a high heat for 8 mins until browned. Tip in the tomatoes, then season and simmer for 20 mins until thick. Meanwhile, crush the potatoes with the remaining oil and spice mix.
Heat the grill to high. Tip the hot sauce into a gratin dish and scatter with the potatoes. The pie can now be cooled and frozen for up to a month. Grill for 8 mins until the potatoes are crispy and golden.
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